The Slurry (content 10 - 40% Solids depending on application) is fed into the Spiral from the top. Spread on the spiral bottom, it moves down by gravity. A transverse flow which is directed inwards on the sluice bottom or outside on the slurry surface is superimposed on the main flow.

This combination results in a separation of the particles contained in the suspension, depending on their density. Particles with a lower specific gravity, such as wood, coal or organic matter, are concentrated in the outer areas of the flow. Particles with a higher specific gravity are transported towards the spiral axits. Two adjustable splitters on the end of the spiral enable the extraction of three fractons heavy, middlings and light density products.

Depending on the possible uses of Spirals for heavy minerals and Spirals for low density media some of the applications are:

• Separating of Ores and Minerals
• Coal Processing
• Decoaling and concentration of heavy mineral sands
• Soil remediation
• Processing of Municipal residue